Problemas al enviar email

[andrespava7]

Hola Kurgans gracias por responder, esta es la configuracion

alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
append_at_myorigin = yes
append_dot_mydomain = no
biff = no
broken_sasl_auth_clients = yes
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/lib/postfix
inet_interfaces = all
local_destination_recipient_limit = 1
local_recipient_maps = unix:passwd.byname $alias_database
local_transport = local
mail_spool_directory = /var/mail
mailbox_command = procmail -a "$EXTENSION"
mailbox_size_limit = 0
message_size_limit = 0
mydestination = $myhostname, $mydomain
mydomain = vs1.midominio.org.local
myhostname = vs1.midominio.org
mynetworks_style = host
myorigin = $myhostname
recipient_delimiter = +
setgid_group = postdrop
smtpd_banner = $myhostname ESMTP ispCP 1.0.7 OMEGA Managed
smtpd_data_restrictions = reject_multi_recipient_bounce, reject_unauth_pipelining
smtpd_helo_required = yes
smtpd_helo_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_invalid_helo_hostname, reject_non_fqdn_helo_hostname
smtpd_recipient_restrictions = reject_non_fqdn_recipient, reject_unknown_recipient_domain, permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, reject_unlisted_recipient, check_policy_service inet:127.0.0.1:12525, check_policy_service inet:127.0.0.1:10023, permit
smtpd_sasl_auth_enable = yes
smtpd_sasl_local_domain =
smtpd_sasl_security_options = noanonymous
smtpd_sender_restrictions = reject_non_fqdn_sender, reject_unknown_sender_domain, permit_mynetworks, permit_sasl_authenticated
transport_maps = hash:/etc/postfix/ispcp/transport
virtual_alias_maps = hash:/etc/postfix/ispcp/aliases
virtual_gid_maps = static:8
virtual_mailbox_base = /var/mail/virtual
virtual_mailbox_domains = hash:/etc/postfix/ispcp/domains
virtual_mailbox_limit = 0
virtual_mailbox_maps = hash:/etc/postfix/ispcp/mailboxes
virtual_minimum_uid = 1000
virtual_transport = virtual
virtual_uid_maps = static:1000

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Te queria preguntar, en cual distro va mejor con la instalacion de ISPCP mi vps tiene 1 nucleo 3.6 amd y ram 512 dedicadas/swap 768